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How to get all ID of the DOM elements with JavaScript ?

  • Last Updated : 31 Dec, 2019

Given a HTML document and the task is to get the all ID of the DOM elements in an array. There are two methods to solve this problem which are discusses below:

Approach 1:

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  • First select all elements using $(‘*’) selector, which selects every element of the document.
  • Use .each() method to traverse all element and check if it has ID.
  • If it has ID then push it in the array.

Example: This example implements the above approach.




<!DOCTYPE HTML>
<html>
  
<head>
    <title>
        How to get all ID of the DOM
        elements with JavaScript ?
    </title>
      
    <script src=
    </script>
</head>
  
<body style="text-align:center;">
      
    <h1 style="color: green"
        GeeksForGeeks 
    </h1>
      
    <p id="GFG_UP"></p>
      
    <button onclick="gfg_Run()">
        Click Here
    </button>
      
    <p id="GFG_DOWN" style="color:green;"></p>
      
    <script>
        var el_up = document.getElementById("GFG_UP");
        var el_down = document.getElementById("GFG_DOWN");
        el_up.innerHTML = "Click on the button to get "
                            + "all IDs in an array.";
  
        function gfg_Run() {
            var ID = [];
            $("*").each(function() {
                if (this.id) {
                    ID.push(this.id);
                }
            });
            el_down.innerHTML = ID;
        }
    </script>
</body>
  
</html>

Output:



  • Before clicking on the button:
  • After clicking on the button:

Approach 2:

  • First select all elements using $(‘*’) selector, Which selects every element of the Document.
  • Use .map() method to traverse all element and check if it has ID.
  • If it has ID then push it in the array using .get() method.

Example 2: This example implements the above approach.




<!DOCTYPE HTML>
<html>
  
<head>
    <title>
        How to get all ID of the DOM
        elements with JavaScript ?
    </title>
      
    <script src=
    </script>
</head>
  
<body style="text-align:center;">
      
    <h1 style="color: green"
        GeeksForGeeks 
    </h1>
      
    <p id="GFG_UP"></p>
      
    <button onclick="gfg_Run()">
        Click Here
    </button>
      
    <p id="GFG_DOWN" style="color:green;"></p>
      
    <script>
        var el_up = document.getElementById("GFG_UP");
        var el_down = document.getElementById("GFG_DOWN");
        el_up.innerHTML = "Click on the button to "
                    + "get all IDs in an array.";
  
        function gfg_Run() {
            var ID = [];
              
            ID = $("*").map(function() {
                if (this.id) {
                    return this.id;
                }
            }).get();
            el_down.innerHTML = ID;
        }
    </script>
</body>
  
</html>

Output:

  • Before clicking on the button:
  • After clicking on the button:



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